Linux环境下加载Spring的问题

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问题描述：

最近在将项目部署到Linux环境下时，出现了加载spring.xml配置文件失败的问题，出错代码：

// Env.SPRING_PATH = /home/is/server/conf/spring.xmlspringContext = new FileSystemXmlApplicationContext(Env.SPRING_PATH);

异常信息：

org.springframework.beans.factory.BeanDefinitionStoreException: IOException parsing XML document from file [/home/is/server/lib/home/is/server/conf/spring.xml]; nested exception is java.io.FileNotFoundException: home/is/server/conf/spring.xml (No such file or directory)at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:344)at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:304)at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:181)at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:217)at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:188)at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:252)at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:127)at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:93)at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:129)at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:613)at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:514)at org.springframework.context.support.FileSystemXmlApplicationContext.<init>(FileSystemXmlApplicationContext.java:140)at org.springframework.context.support.FileSystemXmlApplicationContext.<init>(FileSystemXmlApplicationContext.java:84)at com.is.Initializer.init(Initializer.java:36)at com.is.launcher.App.main(App.java:44)Caused by: java.io.FileNotFoundException: home/is/server/conf/spring.xml (No such file or directory)at java.io.FileInputStream.open0(Native Method)at java.io.FileInputStream.open(FileInputStream.java:195)at java.io.FileInputStream.<init>(FileInputStream.java:138)at org.springframework.core.io.FileSystemResource.getInputStream(FileSystemResource.java:114)at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:330)... 19 more

看异常，意思是说找不到 /home/is/server/lib/home/is/server/conf/spring.xml 这个文件，但实际上传入的文件路径是“/home/is/server/conf/spring.xml”，那为什么spring中该文件路径会发生变化呢？而且报错的路径是home/is/server/conf/spring.xml （注意：这里没有了“/”）。

说明：

异常消息中，前面的路径“/home/is/server/lib”实际上是当前运行程序的路径，如果切换到其它目录则会变成相应路径。

看FileSystemXmlApplicationContext类代码发现：

@Overrideprotected Resource getResourceByPath(String path) {if (path != null && path.startsWith("/")) {path = path.substring(1);}return new FileSystemResource(path);}

该方法在获取资源时，会判断是否以“/”开头，如果是，则剥掉，导致Spring后续加载文件时使用的是不带“/”的文件路径，从而导致加载失败。

Why?

来看下getResourceByPath(String)方法的注释说明：

Resource org.springframework.context.support.FileSystemXmlApplicationContext.getResourceByPath(String path)Resolve resource paths as file system paths. Note: Even if a given path starts with a slash, it will get interpreted as relative to the current VM working directory. This is consistent with the semantics in a Servlet container.

大意：

注：即使给定的路径以斜线开始，它将会被解释为相对当前VM工作目录。这与servlet容器中的语义相一致。

应该就是为了和JavaWeb开发时的环境、用法保持一致吧。

解决方法：

继承FileSystemXmlApplicationContext，重写getResourceByPath(String)方法，如下：

springContext = new FileSystemXmlApplicationContext(Env.SPRING_PATH) {            @Override            protected Resource getResourceByPath(String path) {                if (path != null && path.startsWith("/")) {                    // 忽略如下代码，使其在Linux环境能正常解析文件路径                    // path = path.substring(1);                }                return new FileSystemResource(path);            }        };

OK，修改后可使用指定路径加载了！

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